<!DOCTYPE html>
<html>
<table border="1" width="250" height="100">
	<tr>
		<th>上齐</th>
		<th>居中</th>
		<th>下齐</th>
		<th>基线</th>
	</tr>
	<tr>
		<td valign="top">a</td>
		<td valign="middle">b</td>
		<td valign="bottom">c</td>
		<td valign="baseline">d</td>
	</tr>
</table>
</html>